Biodegradation and mechanical behaviour of sintered compacts of Co-Cr alloy powder doped with ZrO2 used in dentistry

Original scientific paperDirect Metal Laser Sintering process is modern technology and is used in different industries, inclusive in medicine industry.The purpose of this study was to obtain sintered compacts of Co-Cr powder doped with ZrO2 in order to improve the bioactivity of the implants and the behavior in vitro after immersion in simulated biological fluid (SBF) for 21 days.Co-Cr powders (ST2724G) were used to realize one reference sample of Co-Cr and 4 compacts of Co-Cr doped with ZrO2 in the following percents: a) 5 % ZrO2, b) 10 % ZrO2, c) 15 % ZrO2, d) 20 % ZrO2.The morphology and structure of all compacts were determined using scanning electron microscope (SEM), EDS (quantitative and qualitative) and X-ray diffraction analysis (XRD).The microstructures differ in function of concentrations.XRD presents qualitative analysis of Co-Cr probes doped with zirconia and EDS analysis presents qualitative and quantitative analysis of composites compacts, before and after immersion in SBF for 21 days.After immersion in SBF, it can be noticed that the probes of Co-Cr doped with zirconia demonstrate good corrosion resistance and that for the probe Co-Cr doped with 20 % zirconia mechanical resistance is low.In this study the mechanical behavior of Co-Cr powder manufacturing by Direct Metal Laser Sintering (DMLS) process was determined.The sintering machine Phenix Systems type PXS & PXM Dental uses the Co-Cr powder (ST2724G) and for 3D printing use "stl" file.The mechanical tests (traction and compression) was realized with an INSTRON 8810 machine.